22. An athlete running 2.6 m/s increases his velocity to 3.7 m/s in 2.7 s. What is the acceleration of the runner?

0.41 m/s/s

1.2 m/s/s

1.4 m/s/s

2.3 m/s/s

A

B

C

D

23. Which pair of graphs represent the correct relationship between displacement and the velocity of a moving object?

A

B

C

D

24. The graph represents the position of a cart as a function of time.

What is the velocity at 6 seconds?

0.33 m/s

0.43 m/s

0.50 m/s

1.0 m/s

A

B

C

D

25. An object travels around a 120-m radius circular path at a constant 70 m/s. The centipetal force on the object is 3.5 × 104 N. What is the mass of the object?

4.17 × 100 kg

8.57 × 102 kg

6.00 × 104 kg

1.43 × 106 kg

A

B

C

D

26. A boat moves 2.5 m/s north across a river flowing 1.2 m/s east. What is the speed of the boat relative to the shore?

1.3 m/s

2.2 m/s

2.5 m/s

2.8 m/s

A

B

C

D

27. A ball is thrown with a velocity of 12.0 m/s at an angle 30.0° above horizontal. Ignoring air resistance, what is the ballâ€™s vertical component of velocity?

6.00 m/s

6.93 m/s

10.4 m/s

20.8 m/s

A

B

C

D

28. A student pushes a 35-kg block on a frictionless, horizontal surface with a horizontal force of 18 N . If the block is initially at rest, what is the speed of the block after the student pushes the block 20.1 m?

2.3 m/s

4.5 m/s

6.3 m/s

21 m/s

A

B

C

D

29. The diagram represents a block with two applied forces.

Ignoring friction, how much force pulls the object to the left?

120 N

350 N

620 N

720 N

A

B

C

D

30. This diagram represents a 1.9-kg object in static equilibrium hanging from two strings, I and II.

What is the force on string II?

28 N

21 N

19 N

17 N

A

B

C

D

31. A 3.0 × 103-kg truck traveling at 20.0 m/s in a test laboratory collides into a wall and comes to rest in 0.10 s. What is the magnitude of the average force acting on the truck during the collision?

1.5 × 101 N

1.5 × 103 N

6.0 × 103 N

6.0 × 103 N

A

B

C

D

32. A ball is released from the top of an inclined plan as shown below.

Ignoring friction, where will the potential energy (PE) and kinetic energy (KE) of the ball be at a maximum?

PE at J, KE at M

PE at K, KE at L

PE at L, KE at K

PE at M, KE at J

A

B

C

D

33. A 588-N person carrying 294 N of equipment starts climbing a mountain that is 3,118 m high. What is the minimum energy required for the person to climb the mountain?

2.81 × 105 J

9.17 × 105 J

1.83 × 106 J

2.75 × 106 J

A

B

C

D

34. A machine lifts a 35-kg object 20.0 m in 2.0 s. How much power is produced by the machine to lift the object?

350 W

890 W

3,400 W

6,900 W

A

B

C

D

35. A student throws an object downward. The initial kinetic energy of the object is 360 J. When the object reaches the ground, the kinetic energy of the object is 3 times the initial kinetic energy of the object. What was the initial potential energy of the object?

360 J

720 J

1,100 J

1,400 J

A

B

C

D

36. The diagram represents two pulses moving toward each other on a rope.

What occurs when the pulses meet?

A

B

C

D

37. A light ray traveling through air is incident on a pool of water. If the light has an angle of incidence of 30.6°, what is the angle of refraction in the water?

22.5°

30.6°

42.6°

48.8°

A

B

C

D

38. This diagram represents a wave.

If each point on the wave takes 0.020 s to travel from X to Y, what s the period of the wave?

0.0080 s

0.045 s

0.18 s

0.26 s

A

B

C

D

39. If all bulbs and power sources shown are identical, which circuit contains only 2 lit bulbs?